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DECS-150 Troubleshooting
Step 4a. If the DECS-150 is being shunt powered (non-PMG), verify that the power potential transformer
(if used) has the correct turns ratio, is sized properly, and is supplying the correct voltage level
to the power input.
If the turns ratio of the power potential transformer is incorrect, is sized too small, or is not
supplying the correct input power, replace the power potential transformer.
If the power potential transformer is correct, proceed to Step 5.
Step 5. Verify that the sensing potential transformer (if used) has the correct turns ratio and is operating
correctly.
If the turns ratio of the sensing potential transformer is incorrect, replace the sensing potential
transformer.
If the sensing potential transformer is operating correctly, proceed to Step 6.
Step 6. Verify that the front panel Overexcitation Limiter Active indicator is not lit.
If the front panel Overexcitation Limiter Active indicator is lit, check the machine and/or load
conditions. Also check the Field-Current Limit setpoint for the correct level. Interrupt input power
or shut down the machine for a minimum of one minute.
If the front panel Overexcitation Limiter Active indicator is not lit, proceed to Step 7.
Step 7. Low machine output voltage may occur when operating in droop mode with an inductive load.
If the low voltage condition is not caused by the droop function, proceed to Step 8.
Step 8. Verify that the Voltage setpoint is not being modified by application of voltage or current to the
Accessory Input.
If the low voltage condition is not caused by the Accessory Input, proceed to Step 9.
Step 9. Replace the DECS-150 unit.
High Machine Output Voltage
Step 1. Verify that the voltage adjustment is not set too high.
If the voltage adjustment is too high, adjust it to the correct setpoint.
If the voltage adjustment is correct, proceed to Step 2.
Step 2. Verify that the sensing potential transformer (if used) has the correct turns ratio.
If the turns ratio of the sensing potential transformer is incorrect, replace the sensing potential
transformer with the correct one.
If the sensing potential transformer is correct, proceed to Step 3.
Step 3. High machine output voltage may occur when operating in droop mode with a capacitive load.
If the high voltage condition is not caused by the droop function, proceed to Step 4.
Step 4. High machine output voltage may occur when operating in line-drop compensation mode with a
capacitive load.
If the high voltage condition is not caused by the line-drop compensation function, proceed to Step 5.
Step 5. Verify that the Voltage setpoint is not being modified by application of voltage or current to the
Accessory Input.
If the high voltage condition is not caused by voltage applied to the Accessory Input, proceed to
Step 6.
Step 6. Replace the DECS-150 unit.
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